CN112512123A

CN112512123A - Resource management method and base station

Info

Publication number: CN112512123A
Application number: CN202011530580.7A
Authority: CN
Inventors: 朱大琳; 喻斌; 孙鹏飞; 雷鸣
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2014-09-04
Filing date: 2014-09-04
Publication date: 2021-03-16
Also published as: WO2016036111A1; CN105407474A; US20170280467A1; US10306656B2; CN105407474B; KR102435887B1; KR20160028970A

Abstract

The invention discloses a resource management method and a base station, wherein the base station acquires measurement information from a user terminal and determines cell edge users; the base station sends the information of the cell edge users of the cell to an adjacent base station, receives the information of the cell edge users of the adjacent cell from the adjacent base station, and establishes a virtual cell containing the cell edge users according to the information of the cell edge users of the cell and the adjacent cell; the base station sends the configuration information of the cell and the cell edge users of the cell to the base station where the cell edge users in the virtual cell are located, receives the configuration information of the cell edge users and the cell where the cell edge users are located from the base station where the cell edge users are located, and configures uplink and downlink resources and a transmission mode for the virtual cell. The invention effectively avoids the cross time slot interference between the cell edge user terminals, simultaneously meets the requirements of the cell edge user terminals on uplink and downlink asymmetric services, and can improve the cell edge performance and the frequency spectrum use efficiency of a future mobile communication system.

Description

Resource management method and base station

The present application is a divisional application of an invention patent application having an application date of 2014, 9/4, an application number of 201410448542.5, and an invention name of "a resource management method and a base station".

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a resource management method and a base station.

Background

The new generation mobile communication technology has the advantages of simple network architecture, small signal delay, high communication quality, high speed and the like. From the uplink and downlink service multiplexing mode classification, the new generation mobile communication technology can be classified into a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, and an HDD (Hybrid Division Duplex) system. Wherein:

the TDD mode refers to that uplink and downlink use the same operating frequency band, and uplink and downlink signals are transmitted at different time intervals, and a Guard Period (GP) is provided between the uplink and downlink.

The FDD mode means that the uplink and downlink use different operating frequency bands, and uplink and downlink signals can be transmitted on different frequency carriers at the same time, and a Guard bandwidth (Guard Band, GB) exists between the uplink and downlink.

The HDD mode integrates TDD and FDD modes, and on a cell forming a frequency carrier in pairs, a user terminal communicates with a base station on a main control carrier and a controlled carrier according to a pre-appointed communication mode. Specifically, the method comprises the following steps: if all subframes on the controlled carrier are uplink subframes, the user terminal communicates with the base station on the main control carrier and the controlled carrier according to an FDD mode; if the controlled carrier is uplink and downlink time division multiplexing, the user terminal communicates with the base station at the downlink resource of the main control carrier and the uplink resource of the controlled carrier according to the FDD mode, and/or communicates with the base station at the downlink resource of the controlled carrier and the uplink resource of the controlled carrier according to the TDD mode.

In a Long Term Evolution (LTE) system corresponding to an Evolved Universal Radio Access (E-UTRA) protocol established by the third Generation Partnership Project (3rd Generation Partnership Project, 3GPP), a frame structure of a TDD mode is shown in fig. 1, where a Radio frame has a length of 10ms, and includes 10 subframes including two types, i.e., a special subframe and a normal subframe, and each subframe is 1 ms. The special subframes are divided into 3 subframes: DwPTS (Downlink Pilot Time Slot, Downlink Pilot subframe); the GP is used for a guard interval between downlink and uplink; UpPTS (Uplink Pilot Time Slot, Uplink Pilot subframe). The normal subframe includes an uplink subframe and a downlink subframe, and is used for transmitting an uplink/downlink control channel, service data, and the like. In one radio frame, two special subframes (located in subframes 1 and 6) may be configured, and one special subframe (located in subframe 1) may also be configured. The DwPTS subframes in subframe 0 and subframe 5 and the special subframe are always used for downlink transmission, the UpPTS subframes in subframe 2 and the special subframe are always used for uplink transmission, and other subframes may be configured to be used for uplink transmission or downlink transmission as needed.

Specifically, the LTE TDD system supports 7 uplink and downlink configurations, as shown in table 1, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe. As can be seen from table 1, the uplink and downlink resource ratios of the 7 uplink and downlink configurations are different. The number of downlink subframes of the uplink and downlink configuration 5 is the largest, and the ratio of the downlink subframes to the uplink subframes is 9: 1; the number of uplink subframes of the uplink and downlink configuration 0 is the largest, and the ratio of the uplink subframes to the downlink subframes is 3: 2.

TABLE 1 LTE TDD uplink and downlink configuration

In a conventional TDD system, the uplink and downlink sub-frames are dividedThe configuration is static or semi-static, and it is a common practice to determine the ratio division of uplink and downlink subframes according to the cell type and the approximate traffic ratio in the network planning process, and keep the ratio unchanged. This is a simpler and more efficient approach in the context of large macro cell coverage. With the development and evolution of technology, especially in the future 5G (5)^thGeneration) communication system Ultra-dense micro cell (UDN, Ultra-dense Network) deployment scenario, the number of users in each cell is small, and the change of user service requirements is large, so the uplink and downlink service proportion requirements of the cell are dynamically changed.

Under the condition of multi-cell networking, if different cells adopt the same uplink and downlink configuration, or the uplink and downlink transmission directions of adjacent cells at the same transmission time are the same, then on an uplink subframe or a downlink subframe, a user terminal and a base station will be interfered by adjacent cells as shown in fig. 2A or fig. 2B:

Type-I neighbor cell interference shown in fig. 2A: on the sub-frame where the adjacent cell carries out downlink transmission, the downlink reception of the user terminal in the local cell is interfered by the downlink transmission signal of the base station of the adjacent cell;

Type-II neighbor cell interference shown in fig. 2B: on the subframe where the adjacent cell carries out uplink transmission, the base station of the cell receives the interference of the uplink signal of the user terminal of the cell by the uplink transmission signal of the user terminal of the adjacent cell.

In addition, in the multi-cell networking, if the neighboring cells adopt different uplink and downlink configurations, or the transmission directions of the neighboring cells at the same transmission time are different, the base station or the user terminal will be interfered by the neighboring cells as shown in fig. 2C:

Type-III neighbor cell interference shown in fig. 2C: on the subframes with different uplink and downlink transmission directions of the adjacent cells, the base station of the local cell receives the interference of the uplink signal of the user terminal of the local cell by the downlink transmission signal of the base station of the adjacent cell;

Type-IV neighbor cell interference shown in FIG. 2C: on the subframes with different uplink and downlink transmission directions of the adjacent cells, the downlink reception of the user terminal of the local cell is interfered by the uplink transmission signal of the user terminal of the adjacent cell.

Due to the existence of the cross slot interference (Type-III and Type-IV interference), the flexibility of uplink and downlink subframe dynamic configuration in the TDD system is limited. In order to solve the above problems, 3GPP started the eIMTA (Enhancements to LTE Time Division Duplex for Downlink-Uplink Interference Management and Traffic Adaptation) project in 5 months of 2010, and studied how to implement the service Adaptation and Interference Management of the TDD system under the mixed networking condition. The interference management method for the eIMTA project group research comprises cell clustering, frequency division multiplexing, power control and the like. The proposed interference management method is particularly suitable for eliminating or avoiding Type-III interference between base stations. This is because the eIMTA project group considers that Type-III interference between base stations has a greater impact on system performance than Type-IV interference between user terminals. This is mainly because: (1) the transmission power of the base station is much higher than that of the user terminal, and most of channels among the base stations are Line-of-Sight (LoS) channels; (2) from the angle of a statistical theory, the frequency of the Type-III interference is greater than the frequency of the Type-IV interference; (3) the Type-III interference is interference between base stations and is easy to manage and control, and the Type-IV interference is interference between user terminals and is difficult to manage and control.

In future 5G communication systems, ultra-dense microcell deployment has become a trend in order to increase system throughput and improve spectrum efficiency. Particularly, for 5G communication systems, consistent cell center and cell edge performance (de-cell-marginalization) is one of the important indicators for measuring the overall system performance. In this scenario, if different uplink and downlink configurations are adopted between adjacent cells, in addition to the Type-III interference between base stations, the Type-IV interference between user terminals may also reduce the performance of the system cell edge to a great extent. This is because the equivalent distance between the ues in different cells is reduced as the number of cells increases and the coverage of the cells decreases. That is, if different uplink and downlink configurations are adopted between adjacent cells, the frequency and interference level of Type-IV interference between the ues will be much greater than those of 4G system, and it is not negligible.

In summary, no effective solution exists at present for the cross timeslot interference between user terminals and the requirement of the cell edge user terminal for uplink and downlink asymmetric services. Therefore, if a communication method for effectively and feasibly eliminating and/or avoiding cross time slot interference between user terminals can be realized, and simultaneously the requirements of the user terminals, especially the cell edge user terminals, on uplink and downlink asymmetric services are met, the network performance and the frequency spectrum use efficiency of a future mobile communication system can be greatly improved.

Disclosure of Invention

The technical problem to be solved by the invention is that in the current wireless communication system, under the scene that the uplink and downlink resources can be dynamically configured, no solution for effectively eliminating and/or avoiding the cross time slot interference between the user terminals exists, thereby limiting the flexibility of the dynamic configuration of the uplink and downlink resources.

Therefore, the present application provides a resource management method and a base station to improve the cell edge performance, the spectrum utilization rate and the adaptability of the cell edge users to the uplink and downlink asymmetric services of the wireless communication system.

The invention provides a resource management method, which comprises the following steps:

a base station acquires measurement information from a user terminal and determines cell edge users;

the base station sends the information of the cell edge users of the cell to an adjacent base station, receives the information of the cell edge users of the adjacent cell from the adjacent base station, and establishes a virtual cell containing the cell edge users according to the information of the cell edge users of the cell and the adjacent cell;

the base station sends the configuration information of the local cell and the cell edge users of the local cell to the base station where each cell edge user is located in the virtual cell, and receives the configuration information of each cell edge user and the cell where each cell edge user is located from the base station where each cell edge user is located, and the base station configures uplink and downlink resources and a transmission mode for the virtual cell.

Preferably, the measurement information is a combination of one or more measurement information of reference signal received power RSRP, reference signal received quality RSRQ, and signal to interference and noise ratio SINR of the local cell and the neighboring cell measured by the user terminal.

Preferably, the determining cell edge users includes: and according to the measurement information, the appointed threshold and the appointed criterion, the base station divides the user terminal of the cell into a cell center user and a cell edge user.

Preferably, the method further comprises:

the base station sets a cooperative base station set for each user terminal of the cell, and the cooperative base station set is initially an empty set;

for each user terminal, when the relation between the measurement information of the local cell and the adjacent cell measured by the user terminal and the appointed threshold accords with the appointed criterion, the base station adds the base station where the local cell and the adjacent cell are located into the cooperable base station set of the user terminal;

the base station divides the user terminal with the cooperative base station set as an empty set into cell center users, and divides the user terminal with the cooperative base station set not as an empty set into cell edge users.

Preferably, when the base station sends the information of the cell edge user of the cell to the neighboring base station, the method further includes: the base station sends the information of the cooperative base station set corresponding to the cell edge user to all base stations in the cooperative base station set;

when the receiving information of the cell edge user of the neighboring cell from the neighboring base station, further comprises: and the base station receives the information of the cooperative base station set corresponding to the cell edge user from all the base stations in the cooperative base station set.

Preferably, the base station establishing a virtual cell including cell-edge users comprises: the base station combines the cell edge users which can cooperate with the base station to form a virtual cell; the cooperative base station set is a cooperative base station set of the virtual cells, and a cell corresponding to a cooperative base station in the cooperative base station set is a cooperative cell.

Preferably, the configuring, by the base station, uplink and downlink resources and a transmission mode for the virtual cell includes:

the base station configures uplink and downlink transmission resources with the same transmission direction at the same transmission time for all user terminals in the same virtual cell; the transmission mode comprises single-cell transmission and multi-cell cooperative transmission.

Preferably, the information of the cell edge user and the corresponding information of the set of cooperable base stations include: interacting one or more information combinations of user channel state information CSI, user buffer state report BSR, cell load information and cell uplink and downlink configuration information.

Preferably, the configuring, by the base station, uplink and downlink transmission resources in the same transmission time and in the same transmission direction for all the user terminals in the same virtual cell includes:

according to the uplink and downlink configuration information of each cooperative base station, in the subframes with the consistent transmission direction, the base station configures uplink and downlink resources for each user terminal according to the configuration of the corresponding service cell;

and according to the uplink and downlink configuration information of each cooperative base station, configuring uplink and downlink transmission resources with the same transmission direction for each user terminal by the base station in the subframes with different transmission directions.

Preferably, in the subframes with inconsistent transmission directions, the configuring, by the base station, the uplink and downlink transmission resources with consistent transmission directions for each ue includes:

configuring uplink and downlink transmission resources with consistent transmission directions for each user terminal in subframes with inconsistent transmission directions according to system performance indexes; wherein the system performance indicators include one or more of the following: the method comprises the steps of calculating the average throughput and/or the spectrum efficiency of uplink and downlink of each user terminal in a virtual cell, the average throughput and/or the spectrum efficiency of uplink and downlink of all user terminals in a base station and an adjacent base station, the total uplink and downlink resource requirement of each user terminal in the virtual cell and/or the uplink and downlink resource utilization rate of each cooperation cell of the virtual cell.

Preferably, the method further comprises: according to a switching request and response process between all the cooperative base stations of the virtual cell configured by a network side, the base station sends user data and control information to the cooperative base stations of the virtual cell and receives the user data and the control information from the cooperative base stations.

Preferably, the switching request includes the transmission direction information of the terminal at the current moment;

the sending or receiving of user data and control information is implemented through an X2 interface between cooperating base stations of the virtual cell.

Preferably, the method further comprises:

a base station acquires configuration information and configures the uplink and downlink HARQ time sequence relation adopted by a user terminal in the virtual cell;

the configuration information is uplink and downlink timing sequence reference configuration of the cooperative cell set.

Preferably, the uplink subframe set configured by the uplink timing reference of the coordinated cell set is a full set of uplink subframe sets configured by uplink and downlink of all coordinated cells in the coordinated cell set;

the downlink subframe set configured by the downlink timing reference of the coordinated cell set is a full set of downlink subframe sets configured by the uplink and the downlink of all coordinated cells in the coordinated cell set;

the method further comprises the following steps: and the uplink and downlink HARQ time sequence relation of the user terminal in the virtual cell follows the uplink and downlink HARQ time sequence relation configured by the uplink and downlink time sequence reference of the cooperative cell set.

Preferably, the method further comprises: and the base station acquires the uplink and downlink HARQ time sequence relation adopted by the user terminal in the virtual cell from a network side through downlink control information.

Preferably, the method further comprises: and for the subframes with different interference on the user terminal, the base station is respectively configured with different downlink Channel State Information (CSI) measurement and feedback mechanisms.

Preferably, the method further comprises: in the hybrid duplex communication system, the base station communicates with each user terminal in the virtual cell on the downlink resource of the master carrier, and communicates with each user terminal in the virtual cell on the uplink resource of the controlled carrier.

The present application further provides a base station, including: the system comprises a dividing module, a virtual cell establishing module and a resource management module, wherein:

the dividing module is used for determining cell edge users according to the measurement information acquired from the user terminal;

the virtual cell establishing module is used for sending the information of the cell edge users of the cell to an adjacent base station, receiving the information of the cell edge users of the adjacent cell from the adjacent base station, and establishing a virtual cell containing the cell edge users according to the information of the cell edge users of the cell and the adjacent cell;

the resource management module is configured to send configuration information of the local cell and cell edge users of the local cell to a base station where each cell edge user in a virtual cell is located, receive configuration information of each cell edge user and a cell where each cell edge user is located from the base station where each cell edge user is located, and configure uplink and downlink resources and a transmission mode for the virtual cell.

According to the technical scheme, the base station acquires measurement information from the user terminal, cell edge users are determined, information interaction is carried out between the base station and the adjacent base station, the virtual cell containing the cell edge users is established, finally, information interaction is carried out between the base stations where the cell edge users in the virtual cell are located, uplink and downlink resources and transmission modes are configured for the virtual cell, and a resource management technical scheme which is characterized in that the virtual cell is established and the virtual cell users are used as centers is formed, so that cross time slot interference between the cell edge user terminals is effectively avoided, meanwhile, the requirements of the cell edge user terminals on uplink and downlink asymmetric services can be met, and therefore the cell edge performance and the spectrum use efficiency of a future mobile communication system can be improved.

Drawings

FIG. 1 is a frame structure diagram of a TD-LTE system;

fig. 2A is a schematic diagram of interference of neighboring cells with the same timeslot configuration in a first TDD;

fig. 2B is a schematic diagram of interference of neighboring cells with the same timeslot configuration in a second TDD;

fig. 2C is a schematic diagram of third and fourth TDD cross timeslot adjacent cell interference;

fig. 3 is a schematic diagram of a method for managing uplink and downlink resources of a virtual cell according to the present application;

fig. 4 is a schematic diagram illustrating a method for determining a cell center user and a cell edge user by a base station according to the present application;

fig. 5 is a schematic diagram illustrating a method for establishing a virtual cell according to the present application;

fig. 6 is a schematic diagram of a virtual cell uplink and downlink resource allocation method, scheduling and transmission method according to the present application;

fig. 7 is a schematic diagram of a virtual cell uplink and downlink configuration pattern, a homogeneous subframe, and a heterogeneous subframe according to the present application;

fig. 8A is a schematic diagram illustrating a transmission method of a virtual cell at a time of an isomorphic subframe according to a first embodiment of the present application;

fig. 8B is a schematic diagram of an uplink transmission method of a virtual cell at a heterogeneous subframe time in an embodiment of the present application;

fig. 8C is a schematic diagram of a downlink transmission method of a virtual cell at a heterogeneous subframe time in an embodiment of the present application;

fig. 8D is a system-level simulation result of downlink throughput of a cell edge in the first embodiment of the present application;

fig. 8E is a system-level simulation result of uplink throughput of a cell edge in the first embodiment of the present application;

fig. 9 is a schematic diagram of a virtual cell uplink and downlink resource allocation method according to a virtual cell service requirement in the second embodiment of the present application;

fig. 10 is a schematic diagram of a virtual cell uplink and downlink resource allocation method according to resource utilization conditions of each cooperative cell in a virtual cell in the third embodiment of the present application;

fig. 11A is a schematic diagram of a virtual cell uplink and downlink resource allocation method according to virtual cell service requirements and resource utilization conditions of each cooperative cell of a virtual cell in the fourth embodiment of the present application;

fig. 11B is a schematic diagram of a downlink timing relationship of a virtual cell in the fourth embodiment of the present application;

fig. 11C is a schematic diagram of an uplink timing relationship of another virtual cell in the fourth embodiment of the present application;

fig. 12A is a schematic diagram of vertical sectorization of an active antenna system according to a fifth embodiment of the present application;

fig. 12B is a schematic diagram illustrating separation of uplink and downlink transmissions of an active antenna system in a fifth embodiment of the present application;

fig. 12C is a schematic diagram illustrating a method for allocating uplink and downlink resources of a virtual cell in a preferred active antenna system according to a fifth embodiment of the present application;

fig. 13A is a frame structure diagram of a hybrid duplex communication system according to a sixth embodiment of the present invention;

fig. 13B is a schematic diagram illustrating a method for allocating uplink and downlink resources of a virtual cell in a preferred hybrid duplex communication system according to a sixth embodiment of the present application;

fig. 13C is a schematic diagram illustrating a method for allocating uplink and downlink resources of a virtual cell in a preferred hybrid duplex communication system according to a sixth embodiment of the present application;

fig. 14 is a schematic structural diagram of a preferred base station according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.

In order to improve the cell edge throughput of a communication system and the self-adaption of the system to uplink and downlink services, the invention provides a technical scheme for establishing a virtual cell by taking a user as a center and flexibly configuring uplink and downlink resources of the virtual cell. The main idea of the scheme is as follows: the base station determines cell edge users according to the measurement information reported by the user terminal, establishes virtual cells containing the cell edge users through information interaction between the base stations, and flexibly configures uplink and downlink resources of the virtual cells in a unified manner to configure the uplink and downlink resources and a transmission mode for the virtual cells.

The invention can be applied to TDD system (such as TD-LTE system), also can be applied to other systems which need to dynamically adjust the uplink and downlink configuration of the subframe, such as TD-SCDMA system and the subsequent evolution system thereof, WiMAX (Worldwide Interoperability for Microwave Access) system and the subsequent evolution system thereof, HDD system and the subsequent evolution system thereof, and the like.

Fig. 3 is a method for managing uplink and downlink resources of a virtual cell according to the present application, where the method includes:

step 301: a base station acquires the signal and interference level measurement value of a service user (namely, a user terminal in the cell) in the cell; according to the measured value, the appointed threshold and the appointed criterion, the base station classifies the service users of the cell into cell center users and cell edge users; meanwhile, the base station determines a set of cooperable base stations of cell edge users.

Step 302: the base stations exchange necessary information, and a virtual cell is established through the information exchange; meanwhile, the base station determines a virtual cell served by the base station; the base stations serving the same virtual cell constitute a set of cooperating base stations of the virtual cell.

The information interacted between the base stations comprises the following information: and the base station sends the information of the cell edge user and the corresponding information of the cooperative base station set to all base stations in the cooperative base station set. The information interaction between the base stations can be completed through an X2 interface between the base stations, and can also be completed through a centralized processing mode.

Step 303: performing information interaction between the cooperative base stations of the virtual cells, and uniformly configuring uplink and downlink resources of the virtual cells by the cooperative base stations of the virtual cells according to the set system performance indexes; the principle of resource allocation is as follows: and ensuring that the transmission directions of the user terminals in the virtual cell are consistent at the same transmission time.

The information interaction between the cooperative base stations of the virtual cells comprises the following steps: and interacting one or more information combinations of user CSI, user BSR, cell load information and cell uplink and downlink configuration information.

Wherein the system performance indicators include one or more of the following: the method comprises the steps of calculating the average throughput and/or the spectrum efficiency of uplink and downlink of each user terminal in a virtual cell, the average throughput and/or the spectrum efficiency of uplink and downlink of all user terminals in a base station and an adjacent base station, the total uplink and downlink resource requirement of each user terminal in the virtual cell and/or the uplink and downlink resource utilization rate of each cooperation cell of the virtual cell.

The following describes a method for determining the cell center user and the cell edge user of the cell by the base station in step 301 with reference to fig. 4:

step 401: the base station initializes the cooperative base station set of the user terminal in the cell; the initialized set of the cooperable base stations is an empty set.

Step 402: the user terminal measures one or more combinations of Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), and Signal to Interference plus Noise Ratio (SINR) of a current serving cell and neighboring cells of the serving cell, and reports the combinations to the current serving base station.

Step 403: a base station acquires one or more combinations of RSRP, RSRQ and SINR measurement values of a serving cell and an adjacent cell reported by a user terminal of the cell; and the base station updates the set of the cooperable base stations of the user terminal of the cell according to a predetermined threshold.

Step 404: after the cooperable base station set of the user terminal of the cell is updated, the base station classifies the user terminal of the cell; specifically, the users whose cooperative base station set is still an empty set are identified as cell center users; users whose set of cooperable base stations is not an empty set are identified as cell edge users.

Step 405: after finishing classifying the user terminals in the cell, the base station sends information of cell edge users and information of a set of cooperable base stations thereof to all base stations in a set of cooperable base stations thereof, wherein the information of the cell edge users comprises user identity information, a user Buffer Status Report (BSR) and the like, and the information of the set of cooperable base stations thereof comprises cell identity information, uplink and downlink configuration information, cell load information and the like; the information interaction between the base stations can be completed through an X2 interface between the base stations, or through a centralized processing mode.

The following will specifically describe

steps

403 and 404 by taking an example in conjunction with the accompanying drawings and the attached tables:

as shown in fig. 5, the communication system includes two cells, cell #0 and cell # 1. Wherein cell #0 serves user # A and user # C, and cell #1 servesUser # B. Cell #0 and cell #1 are adjacent cells to each other. Taking measurement of RSRP as an example, user # a measures RSRP values of its serving cell #0 and neighboring cell #1, respectively

And reports to its serving cell # 0; user # C measures the RSRP values of its serving cell #0 and neighbor cell #1, respectively

And reports to its serving cell # 0; user # B measures the RSRP values of its serving cell #1 and neighbor cell #0, respectively

And reports to its serving cell # 1. After the cell #0 and the cell #1 acquire RSRP measurement values of their service users, the cooperative base station set of their service users is updated according to the pre-agreed threshold τ, and the service users are classified, as shown in table 2:

TABLE 2 cell center user and cell edge user classification method

For example, cell #0 reports its RSRP measurement value for serving user # a

Comparing with a predetermined threshold tau to obtain

Thus, cell #0 updates the set of cooperable base stations of user # a to { cell #0, cell #1 }. At this time, the set of cooperable base stations updated by the user # a is not an empty set, and the cell #0 identifies the user # a as a cell edge user. Similarly, user # B and user # C are identified as cell edge users and cell center users by cell #0 and cell #1, respectively. It is noted that, given the network topology and user distribution,the size of the threshold value tau directly affects the division result of the cell center user and the cell edge user, and further affects the performance of the method based on the division result. The threshold value tau can be statically or quasi-statically configured through long-term statistical information of a network system; and the network side can also dynamically configure the network through instant feedback information of the user terminal. The application does not limit the specific method for determining the threshold τ, nor the specific method for comparing the measured value reported by the user with the threshold τ.

The method for establishing the virtual cell in step 302 is described below with reference to the accompanying drawings and the attached table as an example:

after the base station finishes classifying the user terminals in the cell, the information of the cell edge users, the information of the cooperative base station set of the cell edge users and the like are sent to all base stations in the cooperative base station set of the cell edge users. Taking the classification results shown in fig. 5 and table 2 as an example, the cell #0 sends the information of the user # a and the information of the cooperative base station set thereof to the cell # 1; similarly, cell #1 sends information of user # B and its cooperable base station set information to cell # 0. After the information interaction is completed, the cell #0 and the cell #1 definitely serve as the cooperative base stations of the user # A and the user # B; meanwhile, a virtual cell including the user # a and the user # B is established as shown in fig. 5. Base station #0 and base station #1 are both cooperative base stations of the virtual cell, as shown in table 3:

table 3: virtual cell establishment results

Users in a virtual cell	Coordinated base station set of virtual cells
		Users # A, # B	Base stations #0, #1

The following describes the configuration method, scheduling and transmission method of the uplink and downlink resources of the virtual cell in step 303 with reference to fig. 6:

step 601: a user terminal in a virtual cell measures Channel State Information (CSI) and feeds back the CSI to a current service base station; in addition, the user terminals in the virtual cell report their current BSR to their current serving base station.

Step 602: after acquiring the information fed back by the user terminal, the cooperative base station of the virtual cell interacts with other base stations in the cooperative base station set for necessary system configuration information and system statistical information. These pieces of information include: one or more combinations of user CSI, user BSR, cell load information, cell uplink and downlink configuration information and the like. The information interaction mode between the cooperative base stations can be realized through an X2 interface between the base stations, and can also be realized through a centralized processing mode.

Step 603: after acquiring the interactive information, the cooperative base station of the virtual cell jointly determines the uplink and downlink resource allocation, scheduling and transmission modes of the virtual cell. In this process, the target base station of the user terminal in the virtual cell is determined. Meanwhile, the target base station reserves uplink and downlink transmission resources for corresponding users in the virtual cell.

Step 604: and establishing a switching request and response process for the relevant user terminals in the virtual cell among the cooperative base stations according to the determined uplink and downlink resource distribution, scheduling and transmission modes of the virtual cell. Specifically, the current serving base station of the relevant user terminal in the virtual cell sends a handover request to its target base station, where the handover request includes the transmission direction information of the user terminal at the current time. And the target base station establishes a switching request and response with the current service base station according to the switching request information, the uplink and downlink configuration information, the load information and the like.

Step 605: after the current service base station of the relevant user in the virtual cell establishes a switching request and response with the target base station, the system reconfigures the communication link between the relevant user in the virtual cell and the target base station. Meanwhile, the current service base station sends the data and control information of the relevant users in the virtual cell to the target base station. Data and control information transmission between the cooperative base stations can be realized through an X2 interface between the base stations, and can also be realized through a centralized processing mode.

Step 606: and the cooperative base station of the virtual cell allocates uplink and downlink resources for the users in the virtual cell to perform uplink and downlink transmission. The uplink and downlink transmission mode may be a single-cell transmission mode or a multi-cell cooperative transmission mode. The uplink and downlink transmission directions of users in the virtual cell are consistent at the same transmission moment, and the Type-IV interference among the users in the virtual cell is avoided.

Before the technical scheme of the present application is explained in detail by embodiments, the present application first defines an uplink and downlink configuration pattern, a homogeneous subframe, and a heterogeneous subframe of a virtual cell.

And each cooperative base station of the virtual cell determines an uplink and downlink configuration pattern of the virtual cell according to the adopted uplink and downlink configuration, and divides the uplink and downlink configuration pattern into a homogeneous subframe and a heterogeneous subframe according to an interference pattern of the uplink and downlink configuration pattern of the virtual cell.

The following describes uplink and downlink configuration patterns, homogeneous subframes, and heterogeneous subframes of a virtual cell with reference to the accompanying drawings:

as shown in fig. 7, user # a and user # B constitute a virtual cell; cell #0 and cell #1 are both cooperative cells of the virtual cell. The cell #0 and the cell #1 perform uplink and downlink transmission by using the uplink and downlink configuration 5 and the uplink and downlink configuration 3, respectively. Then, the uplink and downlink configuration pattern of the virtual cell is a combination of uplink and downlink configuration 5 and uplink and downlink configuration 3. In the uplink and downlink configuration patterns, subframes with the same transmission time and the same transmission direction are isomorphic subframes, and subframes with different transmission directions are heterogeneous subframes.

The technical solution of the present application is further described in detail by several preferred embodiments.

Example one

As shown in fig. 8A, user # a and user # B constitute a virtual cell. Cell #0 and cell #1 are both cooperative cells of the virtual cell. And the cell #0 and the cell #1 respectively adopt the uplink and downlink configuration 5 and the uplink and downlink configuration 3 to perform uplink and downlink transmission, so that the uplink and downlink configuration pattern of the virtual cell is the combination of the uplink and downlink configuration 5 and the uplink and downlink configuration 3. The uplink and downlink resources of the virtual cell are configured by the cooperative base station #0 and the cooperative base station #1 in a unified manner. That is, users in the virtual cell can flexibly reuse uplink and downlink resources of their cooperative cells.

When the uplink and downlink configuration pattern of the virtual cell is a homogeneous subframe, the user in the virtual cell can multiplex the uplink and downlink resources of the serving cell according to the traditional transmission mode. For example, in fig. 8A, the 1 st subframe of the virtual cell uplink and downlink configuration pattern is an isomorphic downlink subframe, and then the user # a can directly multiplex the downlink resource of the serving cell # 0; similarly, the user # B can also directly multiplex the downlink resource of the serving cell #1 to complete the transmission of the downlink subframe. In addition, when the uplink and downlink configuration patterns of the virtual cell are homogeneous subframes, the user in the virtual cell may also transmit in a Coordinated Multi-point (CoMP) manner, and reuse uplink and downlink resources of the Coordinated cell. For example, in fig. 8A, a user # a may simultaneously multiplex downlink resources of the cooperating cell #0 and the cell #1, and use a CoMP Joint Processing (JP) and/or a Coordinated Scheduling/Beamforming (CS/CB) transmission mode. From the perspective of the virtual cell, the uplink and downlink transmission directions of the virtual cell at the time of the homogeneous subframe are consistent with the uplink and downlink transmission directions of the cooperative cell. The method is also suitable for the scene that the isomorphic subframe of the virtual cell is the isomorphic uplink subframe.

When the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the users in the virtual cell multiplex uplink and downlink resources of the cooperative cell according to a designated mode, and simultaneously, the uplink and downlink transmission directions of all the users in the virtual cell are ensured to be consistent at the same transmission time. For example, in fig. 8B, the 4 th subframe of the virtual cell uplink and downlink configuration pattern is a heterogeneous uplink/downlink subframe. At this time, the user # a and the user # B in the virtual cell simultaneously multiplex the uplink resources of the coordinated cell #1 in accordance with a predetermined pattern, and perform uplink transmission. Similarly, as shown in fig. 8C, the 5 th subframe of the virtual cell uplink and downlink configuration pattern is a heterogeneous uplink/downlink subframe. At this time, the user # a and the user # B in the virtual cell simultaneously multiplex the downlink resources of the coordinated cell #0 in accordance with a predetermined pattern, and perform downlink transmission. From the perspective of the virtual cell, the uplink and downlink transmission direction of the virtual cell at the time of the heterogeneous subframe is consistent with the uplink and downlink transmission direction of at least one cooperative cell in the cooperative cell set.

The method is also applicable to the scenario that the number of the cooperative cells is more than two. It should be noted that, in this scenario, when the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the user in the virtual cell may simultaneously reuse the uplink and downlink resources of one cell in its cooperative cell according to a designated mode; in addition, the users in the virtual cell can also multiplex uplink and downlink resources of a plurality of cooperative cells with consistent uplink and downlink transmission directions by adopting a CoMP mode according to a designated mode. To avoid redundancy, an embodiment is not described in the present application.

By the embodiment, it can be seen that uplink and downlink subframes of the virtual cell are uniformly configured, so that uplink and downlink transmission directions of all users in the virtual cell are ensured to be consistent at the same transmission time, and cross timeslot interference among the users in the virtual cell can be completely avoided.

In addition, in order to further verify the beneficial effects of the method provided by the present application, the embodiment also provides a corresponding system level simulation result. In the system-level simulation parameter setting of the present embodiment, the network topology includes 19 stations with hexagonal coverage areas, wherein the inter-station distance is set to be 500 meters. Each site comprises 3 sectors, 4 cells are established in a random point spreading mode in the coverage area of each sector, the radius of each cell is set to be 40 meters, 10 user terminals are uniformly distributed in each cell, and the minimum distance between each user terminal and a cell base station is set to be 10 meters. The data service model is File Transfer Protocol (FTP) service model 1 defined in 3GPP TR 36.814. Wherein, the size of the data packet is fixed to 0.5Mbytes, and the arrival rate lambda of the downlink data packet_DLAnd the arrival rate lambda of the uplink service data packet_ULHas a ratio of 2:1, i.e. lambda_DL：λ_UL2: 1. After the data packet arrives, the data packet is randomly allocated to a user terminal with equal probability. Other simulation assumptions and System parameter referencingRelated settings and descriptions in 3GPP TR 36.828.

The system-level simulation of the present embodiment provides simulation results of four prior arts, wherein the four prior arts are respectively: the method comprises the following steps: static uplink and downlink configuration; the second method comprises the following steps: dynamically configuring cell level uplink and downlink; the third method comprises the following steps: dynamically configuring uplink and downlink of a cell cluster level; the method four comprises the following steps: and carrying out multipoint frequency domain cooperative scheduling. Specifically, in the first method, all cells use the same uplink/downlink configuration 1, and no dynamic adjustment is performed. In the second method, each cell independently and dynamically adjusts the uplink and downlink configuration of the cell, and the period of the dynamic adjustment is 10 ms. In the third method, the cells with strong mutual interference level are divided into the same cell cluster, each cell cluster independently and dynamically adjusts the uplink and downlink configuration of the cell cluster, and the period of the dynamic adjustment is 10 ms. In the fourth method, each cell independently and dynamically adjusts the uplink and downlink configuration of the cell, and the period of the dynamic adjustment is 10 ms; the cells with strong mutual interference level are divided into the same cell cluster, and the cells in the cell cluster separate the user terminals with strong cross time slot interference in the frequency domain scheduling process in a cooperative mode, i.e. the user terminals with strong cross time slot interference are scheduled on different frequency domain resources as much as possible. In addition, the system level simulation of the present embodiment also provides the simulation result of the method provided by the present application. In the method provided by the application, each cell independently and dynamically adjusts the uplink and downlink configuration of the cell, and the period of the dynamic adjustment is 10 ms; the users in the virtual cell can flexibly reuse the uplink and downlink resources of the cooperative cell, and the uplink and downlink transmission directions of all the users in the virtual cell are ensured to be consistent at the same transmission time.

Fig. 8D and fig. 8E are system level simulation results of cell downlink and uplink edge throughput, respectively, in the first embodiment of the present application. In this embodiment, the cell-edge user throughput is defined as the value of the 5 th percentile of the cdf (relative throughput function) curve of all cell users. Compared with the existing method, the method provided by the application has remarkable improvement on the performance indexes of the throughput of the edges of the uplink cell and the downlink cell. In particular, the performance indexThe gain is more pronounced at lower traffic loads. For example, when λ_DLWhen the value is 2, compared with the first method and the second method, the method provided by the application can provide 25% and 31% of uplink cell edge throughput gains respectively.

Example two

As shown in fig. 9, user # a and user # B constitute a virtual cell. Cell #0 and cell #1 are both cooperative cells of the virtual cell. And the cell #0 and the cell #1 respectively adopt the uplink and downlink configuration 5 and the uplink and downlink configuration 3 to perform uplink and downlink transmission, so that the uplink and downlink configuration pattern of the virtual cell is the combination of the uplink and downlink configuration 5 and the uplink and downlink configuration 3. The uplink and downlink resources of the virtual cell are configured by the cooperative base station #0 and the cooperative base station #1 in a unified manner. That is, users in the virtual cell can flexibly reuse uplink and downlink resources of their cooperative cells.

When the uplink and downlink configuration pattern of the virtual cell is a homogeneous subframe, the user in the virtual cell can multiplex the uplink and downlink resources of the serving cell according to the traditional transmission mode. In addition, when the uplink and downlink configuration patterns of the virtual cell are homogeneous subframes, the users in the virtual cell can also transmit in a CoMP mode, and uplink and downlink resources of the coordinated cell are multiplexed. From the perspective of the virtual cell, the uplink and downlink transmission directions of the virtual cell at the time of the homogeneous subframe are consistent with the uplink and downlink transmission directions of the cooperative cell.

When the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the users in the virtual cell multiplex uplink and downlink resources of the cooperative cell according to a designated mode, and simultaneously, the uplink and downlink transmission directions of all the users in the virtual cell are ensured to be consistent at the same transmission time. In this embodiment, each cooperative cell of the virtual cell allocates a better uplink subframe and a better downlink subframe to the virtual cell for transmission according to the total uplink and downlink resource requirements of the virtual cell.

As shown in fig. 9, the downlink resource requirement of the user # a in the virtual cell is twice as much as the uplink resource requirement thereof; conversely, the uplink resource demand of user # B in the virtual cell is twice its downlink resource demand; and, the total amount of uplink and downlink resource demands of the user # A and the user # B are consistent. Then, from the virtual cell perspective, the uplink and downlink resource demand is comparable. Because the uplink and downlink proportion of the homogeneous sub-frame of the virtual cell is determined, each cooperative cell of the virtual cell can meet the uplink and downlink service requirements of the virtual cell by flexibly configuring the uplink and downlink proportion, scheduling and transmission mode of the heterogeneous sub-frame of the virtual cell.

For example, as shown in fig. 9, the uplink-downlink ratio of the isomorphic subframe of the virtual cell is 1: 7; the ratio of uplink and downlink service requirements of the virtual cell is 1: 1. In order to better meet the uplink and downlink resource requirements of the virtual cell, each cooperative cell of the virtual cell configures the heterogeneous subframes of the virtual cell into full uplink subframes, so that the uplink and downlink subframe ratio of the virtual cell is 3: 7. That is, the users # a and # B in the virtual cell perform uplink transmission in heterogeneous subframes (subframe 3 and subframe 4), and the cooperative cell #1 provides uplink resources for them.

The method is also applicable to the scenario that the number of the cooperative cells is more than two. It should be noted that, in this scenario, when the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the user in the virtual cell may simultaneously reuse the uplink and downlink resources of one cell in its cooperative cell according to a designated mode; in addition, the users in the virtual cell can also multiplex uplink and downlink resources of a plurality of cooperative cells with consistent uplink and downlink transmission directions by adopting a CoMP mode according to a designated mode. And each cooperative cell of the virtual cell flexibly configures the uplink and downlink proportion of the heterogeneous subframe of the virtual cell according to the uplink and downlink service demand proportion of the virtual cell and the uplink and downlink proportion of the homogeneous subframe of the virtual cell, thereby better meeting the demand of users in the virtual cell on uplink and downlink asymmetric services. To avoid redundancy, an embodiment is not described in the present application.

EXAMPLE III

As shown in fig. 10, user # a and user # B constitute a virtual cell. Cell #0 and cell #1 are both cooperative cells of the virtual cell. And the cell #0 and the cell #1 respectively adopt the uplink and downlink configuration 5 and the uplink and downlink configuration 3 to perform uplink and downlink transmission, so that the uplink and downlink configuration pattern of the virtual cell is the combination of the uplink and downlink configuration 5 and the uplink and downlink configuration 3. The uplink and downlink resources of the virtual cell are configured by the cooperative base station #0 and the cooperative base station #1 in a unified manner. That is, users in the virtual cell can flexibly reuse uplink and downlink resources of their cooperative cells.

When the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the users in the virtual cell multiplex uplink and downlink resources of the cooperative cell according to a designated mode, and simultaneously, the uplink and downlink transmission directions of all the users in the virtual cell are ensured to be consistent at the same transmission time. In this embodiment, each cooperative cell of the virtual cell allocates a better uplink subframe and a better downlink subframe to the virtual cell for transmission according to the uplink available resource and the downlink available resource and the resource utilization rate, so as to achieve the effect of load balancing among the cooperative cells.

As shown in fig. 10, the uplink and downlink resources of the cooperative cell #0 are high in utilization rate, and the available uplink and downlink resources are few, so that sufficient uplink and downlink resources cannot be provided for the virtual cell; the utilization rate of the uplink and downlink resources of the cooperative cell #1 is low, the available uplink and downlink resources are more, and enough uplink and downlink resources can be provided for the virtual cell. In order to achieve the effect of load balancing among the cooperative cells, users in the virtual cell may reuse uplink and downlink resources of the cooperative cell #1 more. In this embodiment, a user # a and a user # B in a virtual cell perform uplink transmission in heterogeneous subframes (subframe 3 and subframe 4), and a cooperative cell #1 provides uplink resources for the user # a and the user # B; and a user # A and a user # B in the virtual cell perform uplink and downlink transmission in the homogeneous subframe, and a cooperative cell #0 and a cooperative cell #1 provide uplink and downlink resources for the user # A and the user # B, wherein the cooperative cell #1 provides more uplink and downlink resources.

The method is also applicable to the scenario that the number of the cooperative cells is more than two. It should be noted that, in this scenario, when the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the user in the virtual cell may simultaneously reuse the uplink and downlink resources of one cell in its cooperative cell according to a designated mode; in addition, the users in the virtual cell can also multiplex uplink and downlink resources of a plurality of cooperative cells with consistent uplink and downlink transmission directions by adopting a CoMP mode according to a designated mode. And all the cooperative cells of the virtual cell uniformly configure better uplink and downlink resources for the virtual cell according to the allocation condition of uplink and downlink resources, the utilization rate of the uplink and downlink resources and the like. For avoiding redundancy, the present application does not write an embodiment for further description.

Example four

As shown in fig. 11A, the communication system includes three cells, cell #0, cell #1, and cell # 2. Here, cell #0 serves user # a and user # C, cell #1 serves user # B, and cell #2 serves user # D. Cell #0, cell #1, and cell #2 are adjacent cells to each other. User # a, user # B, and user # D constitute a virtual cell. Cell #0, cell #1, and cell #2 are all coordinated cells of the virtual cell. And the cell #0, the cell #1 and the cell #2 respectively adopt the uplink and downlink configuration 5, the uplink and downlink configuration 3 and the uplink and downlink configuration 1 to carry out uplink and downlink transmission, so that the uplink and downlink configuration pattern of the virtual cell is the combination of the uplink and downlink configuration 5, the uplink and downlink configuration 3 and the uplink and downlink configuration 1. The uplink and downlink resources of the virtual cell are configured by the cooperative base station #0, the cooperative base station #1 and the cooperative base station #2 in a unified manner. That is, users in the virtual cell can flexibly reuse uplink and downlink resources of their cooperative cells.

When the uplink and downlink configuration pattern of the virtual cell is a heterogeneous subframe, the users in the virtual cell multiplex uplink and downlink resources of the cooperative cell according to a designated mode, and simultaneously, the uplink and downlink transmission directions of all the users in the virtual cell are ensured to be consistent at the same transmission time. In this embodiment, each cooperative cell of the virtual cell allocates a better uplink subframe and a better downlink subframe to the virtual cell for transmission according to the uplink available resource and the downlink available resource utilization rate of the virtual cell and the total uplink and downlink service requirements of the virtual cell, so as to meet the requirements of users in the virtual cell on uplink and downlink asymmetric services, and achieve the effect of load balancing among the cooperative cells.

In this embodiment, the mobile communication system architecture adopts a Centralized Radio Access Network (C-RAN). Each cooperative cell of the virtual cell is connected to a Baseband processing Unit Pool (BBU Pool, Baseband Unit Pool) at a remote end in an optical fiber backhaul manner. Each cooperative cell of the virtual cell feeds back necessary system configuration information, system statistical information, system state information and the like to the remote baseband processing unit pool. The baseband processing unit pool analyzes and processes the received system configuration information, system statistical information, system state information and the like, and informs each cooperative cell of the virtual cell of the uplink and downlink configuration results and the scheduling mode of the virtual cell. And each cooperation cell of the virtual cell allocates better uplink and downlink resources for uplink and downlink transmission of users in the virtual cell according to the configuration result.

In this embodiment, the system configuration information mainly includes uplink and downlink configurations of each cooperative cell of the virtual cell.

In this embodiment, the system statistical information mainly includes resource utilization rates of each cooperative cell of the virtual cell and total uplink and downlink service requirements of the virtual cell.

In this embodiment, the system state information mainly includes a network topology structure, user distribution, and the like.

As shown in fig. 11A, the cooperative cell #0 has a high uplink and downlink resource utilization rate, and the available uplink and downlink resources are few; the utilization rate of uplink and downlink resources of the cooperative cell #1 is low, and more uplink and downlink resources are available; the cooperative cell #2 has a high uplink resource utilization rate, a small number of available uplink resources, a low downlink resource utilization rate, and a large number of available downlink resources.

As shown in fig. 11A, the downlink resource requirement of the user # a in the virtual cell is twice as much as the uplink resource requirement thereof; the uplink resource demand of the user # B in the virtual cell is twice of the downlink resource demand; the downlink resource requirement of user # D in the virtual cell is three times its uplink resource requirement. And the total uplink and downlink resource demands of the user # A, the user # B and the user # D are basically consistent. Then, from the virtual cell's perspective, its demand for downlink resources is higher than its demand for uplink resources.

Comprehensively considering, when configuring uplink and downlink resources and scheduling and transmission modes of a virtual cell, the baseband processing unit pool allocates more downlink subframes for users in the virtual cell, so that the uplink and downlink proportion in the uplink and downlink configuration of the virtual cell is close to the actual uplink and downlink service demand proportion, and the demand of users in the virtual cell on uplink and downlink asymmetric services is met. Meanwhile, users in the virtual cell can reuse uplink and downlink resources of the cell #1 and/or downlink resources of the cell #2 as much as possible, and the effect of load balancing among the cooperative cells is achieved.

Because the uplink and downlink subframes of the virtual cell are flexibly configured by the cooperative cell, in order to avoid the Hybrid Automatic Repeat Request (HARQ) timing confusion between the user terminal and the cooperative base station in the virtual cell, it is necessary to re-agree the HARQ and/or scheduling timing of the uplink and downlink data of the user in the virtual cell.

In the present application, the HARQ transmission timing relationship of uplink and downlink data of users in a virtual cell is determined by the HARQ transmission timing relationship of uplink and downlink data in a cooperative cell.

First, as shown in table 1, the dependency relationship between the uplink and downlink subframe sets among the 7 uplink and downlink configurations can be determined. For example, the downlink subframe index of the uplink and downlink configuration 0 is 0,1,5, 6; the downlink subframe index of the uplink and downlink configuration 6 is 0,1,5,6,9, and thus the downlink subframe set of the uplink and downlink configuration 0 is a subset of the downlink subframe set of the uplink and downlink configuration 6. In addition, the downlink subframe index of the uplink/downlink configuration 3 is 0,1,5,6, 7, 8,9, and therefore, the downlink subframe set of the uplink/downlink configuration 0 and the downlink subframe set of the uplink/downlink configuration 6 are subsets of the downlink subframe set of the uplink/downlink configuration 3. In addition, the downlink subframe indexes of the uplink and downlink configuration 1 are 0,1, 4,5,6, and 9, and therefore, the downlink subframe sets of the uplink and downlink configuration 0 and the uplink and downlink configuration 6 are also subsets of the downlink subframe set of the uplink and downlink configuration 1. However, the downlink subframe sets of the uplink and downlink configuration 3 and the uplink and downlink configuration 1 are not subsets of each other. Similarly, the downlink subframe index of the uplink and downlink configuration 4 is 0,1, 4,5,6, 7, 8,9, and thus, the downlink subframe sets of the uplink and downlink configuration 1 and the uplink and downlink configuration 3 are a subset of the downlink subframe set of the uplink and downlink configuration 4.

In general, for 7 uplink and downlink configurations shown in table 1, the downlink subframe set of uplink and downlink configuration 0 is a subset of downlink subframe sets of other uplink and downlink configurations; the downlink subframe set of the uplink and

downlink configuration

0,1, 2, 3,4, 6 is a subset of the downlink subframe set of the uplink and downlink configuration 5.

In addition, the subordination relation of the uplink subframe set between the uplink configuration and the downlink configuration is opposite to the subordination relation of the downlink subframe set. That is, for the 7 uplink and downlink configurations shown in table 1, the uplink subframe set of the uplink and downlink configuration 5 is a subset of uplink subframe sets of other uplink and downlink configurations; the uplink subframe set of the uplink and

downlink configuration

1, 2, 3,4,5,6 is a subset of the uplink subframe set of the uplink and downlink configuration 0.

By determining the subordinate relationship between the uplink subframe set and the downlink subframe set between the uplink configuration and the downlink configuration, it can be obtained that if the downlink subframe set of the uplink configuration x is a subset of the downlink subframe set of the uplink configuration y, the uplink configuration x may adopt the downlink HARQ response timing relationship of the uplink configuration y, and the uplink configuration y is referred to as the downlink timing reference configuration of the uplink configuration x. Meanwhile, the uplink subframe set of the uplink and downlink configuration y is a subset of the uplink subframe set of the uplink and downlink configuration x, the uplink and downlink configuration y can adopt an uplink HARQ response timing relationship of the uplink and downlink configuration x, and the uplink and downlink configuration x is referred to as uplink timing reference configuration of the uplink and downlink configuration y.

In this embodiment, the uplink and downlink configurations of the coordinated cell #0, the cell #1, and the cell #2 of the virtual cell are uplink and downlink configuration 5, uplink and downlink configuration 3, and uplink and downlink configuration 1, respectively. According to the subordination relation between the uplink and downlink configuration, the uplink and downlink configuration 5 is the downlink timing reference configuration of the whole cooperation cell set, and the uplink and downlink configuration 6 is the uplink timing reference configuration of the whole cooperation cell set.

The uplink and downlink subframes of the virtual cell are dynamically and flexibly configured by the cooperative cell. And the uplink and downlink subframe sets configured by the uplink and downlink of the virtual cell are all subsets of the uplink and downlink subframe sets configured by the uplink and downlink timing reference of the cooperative cell set. Therefore, the user in the virtual cell can adopt the uplink and downlink HARQ response time sequence relation configured by the uplink and downlink time sequence reference of the cooperative cell set, thereby avoiding time sequence confusion and resource waste.

As shown in fig. 11B, the virtual cell in this embodiment adopts a downlink HARQ response timing relationship of uplink and downlink configuration 5; as shown in fig. 11C, the virtual cell in this embodiment adopts the uplink HARQ response timing relationship of the uplink and downlink configuration 6.

The network side informs the corresponding uplink and Downlink HARQ response time sequence relation of the user through Downlink Control Information (DCI).

In addition, uplink and downlink HARQ response information of the virtual cell users needs to be interacted between the virtual cell cooperative base stations, so as to better configure uplink and downlink retransmission resources for the virtual cell users. The interaction of the uplink and downlink HARQ response information can be realized through an X2 interface between the base stations, and also can be realized through a centralized processing method.

In addition, because the uplink and downlink subframes of the virtual cell are flexibly configured by the cooperative cell, the actual channel conditions on different downlink subframes have obvious difference due to different interference directions and/or transmission modes of the cooperative cell. That is, CSI measured on a certain downlink subframe may not be applicable to other downlink subframes with different cooperative cell interference directions and/or transmission manners. For example, CSI measured by a virtual cell user at a time of a homogeneous downlink subframe is not suitable for its transmission at a time of a heterogeneous downlink subframe. For another example, CSI measured by a virtual cell user at a certain heterogeneous downlink subframe time is not suitable for transmission at other heterogeneous downlink subframe times. Therefore, it is necessary to re-agree on the channel measurement configuration and downlink CSI feedback method for the users in the virtual cell.

Firstly, the isomorphic downlink subframes and the heterogeneous downlink subframes of the uplink and downlink configuration patterns of the virtual cell are grouped.

All the homogeneous downlink subframes in the uplink and downlink configuration pattern of the virtual cell may be divided into the same downlink subframe group, which is called: a homogeneous set of downlink subframes.

At the time of a heterogeneous downlink subframe in a virtual cell uplink and downlink configuration pattern, if the current subframe direction of one or more cooperative cells is different from that of the virtual cell (i.e., uplink), various interference direction combinations can be obtained. The heterogeneous downlink subframes with the same interference direction combination are divided into the same downlink subframe group, which is called as: a heterogeneous set of downlink subframes.

In this embodiment, assuming that the uplink and downlink configurations of the cooperative cell #0, the cell #1, and the cell #2 of the virtual cell are uplink and downlink configuration 5, uplink and downlink configuration 3, and uplink and downlink configuration 1, respectively, the partition manners of the homogeneous downlink subframe group and the heterogeneous downlink subframe group of the virtual cell are as shown in table 4:

TABLE 4 isomorphic and heterogeneous downlink subframe sets

Subframe index

0

1

2

3

4

5

6

7

8

9

Virtual cell

D

S

U

D

S

U

D

Cell #0

D

S

U

D

Cell #1

D

S

U

D

Cell #2

D

S

U

D

S

U

D

Subframes

0,1,3,4,5,6,8, and 9 are subframes in which the transmission direction in the virtual cell is downlink or includes downlink pilot time slots. Wherein, the

subframes

0,1,5,6,9 are isomorphic downlink subframes, and then the

subframes

0,1,5,6,9 are divided into isomorphic downlink subframe groups. In addition,

subframes

3,4, and 8 are heterogeneous downlink subframes. Wherein, the transmission direction combinations of the

subframes

3,4,8 corresponding to the cells #0, #1, #2 are respectively: (D, U, U), (D, U, D) and (D, D, U), which are different from each other. Therefore, the

subframes

3,4, and 8 are divided into different heterogeneous downlink subframe groups, which are referred to as first, second, and third heterogeneous downlink subframe groups.

In addition, for the same-class heterogeneous downlink subframe group, the actual channel conditions are different because users in the virtual cell may adopt different transmission modes (single-cell transmission or multi-cell cooperative transmission). For example, in this embodiment, the user # B in the virtual cell uses single-cell transmission on subframe 8 (the third heterogeneous downlink subframe group) of the radio frame X, and multiplexes the downlink resource of the cell # 0. It multiplexes downlink resources of cell #0 and cell #1 using multi-cell cooperative transmission on subframe 8 of radio frame Y (Y ≠ X). For the user # B, due to different transmission modes adopted on the similar heterogeneous downlink subframe sets of the radio frames X and Y, the channel conditions experienced by the user # B on the similar heterogeneous downlink subframe sets of the radio frames X and Y are different, and different CSI measurement and feedback methods need to be configured accordingly. In summary, on the basis of grouping the heterogeneous downlink subframes, it is necessary to further number the homogeneous heterogeneous downlink subframe groups according to combinations of different transmission schemes. For example, in this embodiment, for the third type heterogeneous downlink subframe group, the transmission mode combinations that can be adopted by the users in the virtual cell are as follows: single cell #0 transmission, single cell #1 transmission, and cell #0, cell #1 coordinated transmission, which may be numbered as: and the third heterogeneous downlink subframe group transmission modes #0, #1 and # 2.

It should be noted that the embodiments of the present invention are not limited to the above dividing manner, and other methods capable of dividing the downlink subframe group according to the interference situation on the downlink subframe, the scheduling and the transmission manner are all applicable to the present invention.

In the present application, measurement and feedback of downlink CSI are performed in an aperiodic manner.

Specifically, the network side informs the user terminal in the virtual cell of the subframe grouping and numbering conditions through signaling, for example, informs the user terminal in the virtual cell of the category of each downlink subframe group, the number in the same-type heterogeneous downlink subframe group, the CSI measurement feedback period of the same-type heterogeneous downlink subframe group with the same number, and the like through high-layer signaling.

In addition, the network side triggers the user in the virtual cell to feed back the downlink CSI of at least one downlink subframe group. That is, the ue in the virtual cell feeds back the corresponding measurement result after receiving the trigger from the network side.

Preferably, the network side may trigger the user terminal in the virtual cell to feed back the downlink CSI of at least one downlink subframe group on a corresponding pusch (physical Uplink Shared channel) resource through cqi (channel Quality indicator) request information in the UL grant. Correspondingly, the user terminal in the virtual cell feeds back the measurement result after determining that the feedback is needed according to the received CQI request information in the UL grant.

In addition, downlink CSI fed back by the virtual cell user needs to be interacted between the virtual cell cooperative base stations, so as to better configure uplink and downlink resources for the virtual cell user. The interaction of the downlink CSI can be realized through an X2 interface between base stations, and also can be realized through a centralized processing method.

EXAMPLE five

In the embodiment of the invention, the base station adopts an Active Antenna System (AAS) and configures uplink and downlink resources and scheduling and transmission modes for virtual cell users in a space division multiplexing mode. The active antenna system is formed by integrating each radiating element in the antenna array with a corresponding radio frequency/digital circuit module, and is an active antenna array capable of independently controlling each array through a digital interface. The appearance of the vertical dimension port in the AAS system has significant influence on multiple aspects such as the base station and antenna structure, the spectrum utilization rate, the network architecture and the operation and maintenance cost. In addition, with the further development of AAS technology, 3D-MIMO (3-Dimensional Multiple-Input Multiple-Output) and large-scale antenna (massive MIMO) technologies based on AAS are becoming key technologies in 5G communication systems. As shown in fig. 12A, based on the AAS array, the original cell may be subdivided into inner-ring and outer-ring sub-cells with different downtilts in the vertical dimension, so as to implement vertical sectorization and further improve the spectrum utilization. In addition, as shown in fig. 12B, independent optimization of uplink and downlink can be achieved by using the flexibility of the AAS array in vertical dimension adjustment, so as to avoid inter-cell interference and improve the adaptability of the system to uplink and downlink asymmetric services.

As shown in fig. 12C, user # a and user # B constitute a virtual cell. Cell #0 and cell #1 are both cooperative cells of the virtual cell. The cell #0 and the cell #1 perform uplink and downlink transmission by using the uplink and downlink configuration 5 and the uplink and downlink configuration 3, respectively. Both base station #0 and base station #1 employ an active antenna system. Wherein the active antenna array is divided into two parts in vertical dimension

And

where x is the cell index, and in this embodiment, x is #0 and #1, respectively. By adjusting and optimizing the antenna downtilt angle,

an antenna array configured to serve virtual cell users,

an antenna array configured to serve users in the center of the cell. In the present embodiment, it is preferred that,

and

to serve the antenna array of the virtual cell users, single-point transmission and/or coordinated multi-point transmission may be employed. By utilizing the flexibility of the AAS array in vertical dimension adjustment and the antenna selection technology, the virtual cell can be configured with an uplink and downlink configuration different from that of its cooperative cell, in this embodiment, the virtual cell performs uplink and downlink transmission by using uplink and downlink configuration 2. In this embodiment, at the time of subframe 7, cell #0 and cell #1 are downlink subframes, respectively, and the virtual cell is an uplink subframe. User # C in cell #0 receives the antenna array

For downlink data to be transmitted, user # D in cell #1 receives the antenna array

And sending the downlink data. The uplink data of the user # A and the user # B in the virtual cell pass through the antenna array of the base station #0 respectively

And base station #1

And receiving. In addition, the user # A and the user # BThe row data may also pass through the antenna array of base station #0

And base station #1

And carrying out multipoint cooperative reception.

Because the user terminals in the virtual cell adopt the same uplink and downlink configuration, the cross time slot interference is not generated between the user terminals in the virtual cell. Since the geographical distance between the central users of the neighboring cells (e.g., user # C and user # D in this embodiment) is relatively long, cross-slot interference can be avoided by using beamforming. In addition, since the base station of the cell knows it is

And/or

The configuration information such as the power and direction of the uplink downlink transmission signal, and the cross slot interference between the virtual cell users (for example, user # a and user # B in this embodiment) and the cooperative cell center users (for example, user # C and user # D in this embodiment) may be solved by methods such as beamforming, power and downtilt optimization control, selective scheduling, and self-interference cancellation. In addition, in this scenario, the uplink and downlink dynamic configuration period, the downlink CSI measurement and feedback, the uplink and downlink HARQ response timing, and the like of the virtual cell user and the central user terminal of the cooperative cell can be configured independently. The configuration information may be obtained through higher layer signaling, or physical layer signaling.

EXAMPLE six

In this embodiment, the uplink and downlink transmission of the system adopts a hybrid duplex mode. Fig. 13A is a frame structure diagram of a hybrid duplex communication system according to the present application. The hybrid duplex communication system adopts frame structure parameter design of LTE, including subcarrier spacing, Cyclic Prefix (Cyclic Prefix), radio frame length and subframe length, so that for standard Cyclic Prefix (Normal CP), one subframe comprises 14 symbols with the length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21us, and the CP lengths of the other 6 symbols are 4.69 us; for Extended Cyclic Prefix (Extended CP), one subframe contains 12 symbols, and the CP length of all symbols is 16.67 us.

As shown in fig. 13A, the hybrid duplex communication system includes paired carriers, wherein the radio frame structure of the main control carrier includes a special subframe, and the special subframe includes three portions, namely a downlink special timeslot, a guard timeslot, and an uplink pilot timeslot. A Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH) of the Primary carrier are used for the terminal to perform cell search and transmit in a downlink special time slot of the special subframe. In addition, like the LTE System, the primary carrier further includes a Dynamic Broadcast Channel (DBCH), the Physical Downlink Control Channel (PDCCH) is used to schedule and indicate the DBCH, and other necessary broadcast signaling (SIB, System Information Block) besides the broadcast signaling (MIB) on the PBCH is carried.

The hybrid duplex wireless communication base station carries out downlink transmission at a downlink subframe and a downlink special time slot of a main control carrier, and receives a detection pilot signal at an uplink pilot time slot of the special subframe of the main control carrier for obtaining channel reciprocity, thereby reducing feedback overhead required by multi-antenna transmission (such as beamforming).

The user terminal supporting the hybrid duplex wireless communication carries out cell search on the main control carrier, acquires downlink synchronization and cell identification, and further reads the broadcast information on the main control carrier.

The broadcast message sent by the hybrid duplex wireless communication base station contains configuration information of special subframes, frequency point position and bandwidth information of a controlled carrier, configuration information of a wireless frame structure of the controlled carrier and the like.

The user terminal communicates with the base station on the main control carrier and the controlled carrier according to a predetermined communication mode, specifically: if all subframes on the controlled carrier are uplink subframes, the user terminal communicates with the base station on the main control carrier and the controlled carrier according to an FDD mode; if the controlled carrier is uplink and downlink time division multiplexing, the user terminal communicates with the base station at the downlink resource of the main control carrier and the uplink resource of the controlled carrier according to the FDD mode, and/or communicates with the base station at the downlink resource of the controlled carrier and the uplink resource of the controlled carrier according to the TDD mode.

As shown in fig. 13B, user # a, user # B, and user # D constitute a virtual cell. Cell #0 and cell #1 are both cooperative cells of the virtual cell. The base station and the user terminal both adopt a hybrid duplex communication mode. Among them, the master carrier frame structures of cell #0 and cell #1 are the master carrier frame structures shown in fig. 13A. The cell #0 and the cell #1 adopt TDD frame structures of uplink and

downlink configurations

5 and 3 on controlled carriers, respectively. The master carrier frame structure of the virtual cell is the same as the master carrier frame structure of cell #0 and cell # 1. The uplink and downlink configuration pattern of the virtual cell on the controlled carrier is the combination of uplink and downlink configuration 5 and uplink and downlink configuration 3. The uplink and downlink resources of the virtual cell are uniformly configured on the main control carrier and the controlled carrier by the cooperative base station #0 and the base station # 1. That is, users in the virtual cell can flexibly reuse uplink and downlink resources of their cooperative cells.

When the uplink and downlink configuration patterns of the controlled carrier of the virtual cell are isomorphic subframes, the user in the virtual cell can multiplex uplink and downlink resources of the serving cell on the main control carrier and the controlled carrier according to a traditional transmission mode. In addition, when the uplink and downlink configuration patterns of the controlled carrier of the virtual cell are isomorphic subframes, the users in the virtual cell can also transmit in a CoMP mode, and uplink and downlink resources of the cooperative cell are multiplexed on the master control carrier and the controlled carrier.

When the uplink and downlink configuration pattern of the controlled carrier of the virtual cell is a heterogeneous subframe, the user in the virtual cell multiplexes the uplink and downlink resources of the main control carrier and the controlled carrier of the cooperative cell according to a designated mode. The cooperative base station of the virtual cell uniformly configures uplink and downlink resources of a main control carrier and a controlled carrier for users in the virtual cell according to the average interference level among the users in the virtual cell, the position information of the user terminal, the BSR of the user terminal, the load information of each cooperative cell and the like, and performs uplink and downlink transmission.

For example, as shown in fig. 13C, downlink resources of user # a and user # D in the virtual cell are in high demand, and the cooperative base station #0 and base station #1 in the virtual cell provide downlink resources on the primary control carrier for user # a and user # D in the virtual cell in the 4 th subframe. The cooperative base station #0 and the base station #1 transmit downlink data required by the user # A in a CoMP mode; base station #0 transmits downlink data required for user # D in a single cell manner. The uplink resource requirements of the user # B and the user # D in the virtual cell are large, and the cooperative base station #1 of the virtual cell provides uplink resources for the user # B and the user # D on the controlled carrier in the 4 th subframe. Obviously, since uplink and downlink transmissions of users in the virtual cell occur on different frequency carriers, in this scenario, there is no cross slot interference between user terminals in the virtual cell.

Similarly, in a hybrid duplex system, other methods for flexibly configuring uplink and downlink resources of a master carrier and a controlled carrier for a virtual cell exist. For example, each cooperating cell of the virtual cell configures uplink and downlink resources for users in the virtual cell in a unified manner according to the load conditions of the cooperating cell on the master carrier and the controlled carrier. For avoiding redundancy, the present application does not write an embodiment for further description.

If each cooperative cell of the virtual cell cannot allocate resources of the master control carrier to the user in the virtual cell, the uplink and downlink resource allocation manner of the virtual cell on the controlled carrier is performed according to the method described in the first, second, third, fourth, and fifth embodiments.

Corresponding to the method, the application also discloses a base station, which is briefly described below with reference to the attached drawings.

Fig. 14 is a schematic structural diagram of a preferred base station according to the present application, the base station including: the system comprises a dividing module, a virtual cell establishing module and a resource management module, wherein:

the virtual cell establishing module is used for performing information interaction with an adjacent base station and establishing a virtual cell containing cell edge users;

and the resource management module is used for performing information interaction with a base station where edge users of each cell in the virtual cell are located, and configuring uplink and downlink resources and a transmission mode for the virtual cell.

Preferably, the base station shown in fig. 14 may further include a configuration module, where the configuration module is configured to configure a transmission direction of each subframe of the virtual cell; in the hybrid duplex system, the transmission direction of each subframe on a controlled carrier of a virtual cell is configured; configuring a scheduling mode of a virtual cell user; configuring the response time sequence of the uplink and downlink HARQ of the virtual cell user; configuring a measurement and feedback mechanism of a virtual cell user downlink CSI; an antenna array serving virtual cell users is configured.

Preferably, the base station shown in fig. 14 may further include a receiving module, where the receiving module is configured to receive RSRP/RSRP and uplink sounding pilot signals sent by the user terminal; the buffer area state information and the position information are sent by the user terminal; the received information is provided to other modules for use.

Preferably, the dividing module is further configured to group and number the homogeneous downlink subframes and the heterogeneous downlink subframes of the virtual cell according to the uplink and downlink configuration pattern of the virtual cell.

Preferably, the base station shown in fig. 14 may further include a communication module, where the communication module is configured to communicate with the terminal in uplink and downlink resources of each subframe; in a hybrid duplex system, when all subframes of a controlled carrier are uplink subframes, communicating with a terminal on a main control carrier and the controlled carrier according to an FDD mode; the terminal is used for communicating with the terminal at the downlink resource of the master control carrier and the uplink resource of the controlled carrier according to an FDD mode and/or communicating with the terminal at the downlink resource of the controlled carrier and the uplink resource of the controlled carrier according to a TDD mode when the controlled carrier is uplink and downlink time division multiplexing; the system configuration information comprises uplink and downlink configuration information, terminal information and the like, and is used for communication among base stations and receiving and sending the system configuration information; receiving and sending system statistical information including uplink and downlink service information of a terminal, load information of a base station and the like; receiving and transmitting system state information including uplink and downlink HARQ response time sequence relation and the like; receiving and sending a switching request and a response of a virtual cell user; receiving and transmitting data and control information of a virtual cell user; and interacting the downlink CSI measurement information of the virtual cell users.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method performed by a base station in a wireless communication system, comprising:

the base station sends the information of the first user of the first cell to the second base station and receives the information of the first user of the second cell from the second base station;

the base station sends the first cell and the configuration information of the first users of the first cell to the base station where the first users are located, and receives the configuration information of the first users and the cell where the first users are located from the base station where the first users are located.

2. The method of claim 1, wherein the first user is a user terminal having a relation between the measurement information and the agreed threshold meeting agreed criteria.

3. The method of claim 2, wherein:

when the base station sends the information of the first user of the first cell to the second base station, the method further comprises the following steps: the base station sends the information of the cooperative base station set corresponding to the first user to all base stations in the cooperative base station set;

when the receiving information of the first user of the second cell from the second base station, further comprises: and the base station receives the information of the cooperative base station set corresponding to the first user from all base stations in the cooperative base station set.

4. The method of claim 1, wherein:

the information of the first user and the corresponding information of the set of cooperable base stations comprise: the combination of one or more of user channel state information CSI, user buffer state report BSR, cell load information and cell uplink and downlink configuration information.

5. The method of claim 1, wherein:

the method further comprises the following steps: receiving a switching request and response between cooperative base stations, sending user data and control information to the cooperative base stations, and receiving the user data and the control information from the cooperative base stations.

6. The method of claim 5, wherein:

the switching request comprises the transmission direction information of the terminal at the current moment;

sending or receiving user data and control information is accomplished through an X2 interface between cooperating base stations.

7. The method of claim 1, further comprising:

the base station sends configuration information and configures the uplink and downlink HARQ time sequence relation adopted by the user terminal;

the configuration information is uplink and downlink timing sequence reference configuration of the cooperative base station set.

8. The method of claim 7, wherein:

the uplink subframe set configured by the uplink timing reference of the cooperative base station set is a full set of uplink subframe sets configured by the uplink and the downlink of all cooperative cells in the cooperative base station set;

the downlink subframe set configured by the downlink timing reference of the cooperative base station set is a full set of downlink subframe sets configured by the uplink and the downlink of all cooperative cells in the cooperative base station set;

the method further comprises the following steps: and the uplink and downlink HARQ time sequence relation of the user terminal follows the uplink and downlink HARQ time sequence relation configured by the uplink and downlink time sequence reference of the cooperative base station set.

9. The method of claim 8, wherein: the downlink control information includes the uplink and downlink HARQ timing relationship adopted by the user terminal.

10. A base station, comprising: virtual cell establishes module and resource management module, wherein:

the virtual cell establishing module is used for sending the information of the first user of the first cell to the second base station and receiving the information of the first user of the second cell from the second base station;

the resource management module is configured to send the first cell and the configuration information of the first users of the first cell to the base station where the first users are located, and receive the configuration information of the first users and the configuration information of the cell where the first users are located from the base station where the first users are located.